There may be no single cause of bipolar disorder (aka manic depression). Instead, research indicates the causes of bipolar disorder are probably a combination of biochemical, genetic and environmental factors that may trigger and perpetuate the chemical imbalances in the brain.
Net worth: $829 million. Telecommunications mogul Strive Masiyiwa is widely regarded as the richest man in Zimbabwe and is one of the richest men in Africa with a net worth of more than US$800 million.
Richest Black Women in the World 2017. Folorunsho Alakija, Isabel dos Santos, Hajia Bola Shagaya, Ngina Kenyatta, and many other females are the richest women in Africa. Due to their talent and hard work, they gained wealth and popularity. Many rich and talented women are from Nigeria.